I recently followed the instructions onDeploying to Heroku Cloud to deploy a MySQL-driven app to Heroku.

Once deployed, the app didn't work as expected because I didn't configure a database. I wrongly assumed that this was done automatically because the instructions didn't mention anything about a database.

I managed to make it work by followingthis guide.

To improve the developer experience, I think the deployment instructions should contain an optional section on configuring a database.

As a plan B, they should at least mention that they don't cover database configuration.

Please let me know if you'd like such an expansion of the article covering Heroku deployment. If you do, I can make a pull request.